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(A) Aniline and phenol form a non-ideal solution showing negative deviation from Raoult's Law due to hydrogen bonding between the amine group of anili

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$80$

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(A) Aniline and phenol form a non-ideal solution showing negative deviation from Raoult's Law due to hydrogen bonding between the amine group of aniline and the hydroxyl group of phenol.For a solution showing negative deviation,the total vapour pressure $(P_{total})$ is less than the vapour pressure calculated by Raoult's Law $(P_{ideal})$.First,calculate the mole fractions:$n_{aniline} = 10 \, moles$,$n_{phenol} = 20 \, moles$.Total moles = $10 + 20 = 30 \, moles$.$x_{aniline} = 10 / 30 = 1/3$,$x_{phenol} = 20 / 30 = 2/3$.$P_{ideal} = x_{aniline} 	imes P^0_{aniline} + x_{phenol} 	imes P^0_{phenol} = (1/3 	imes 90) + (2/3 	imes 87) = 30 + 58 = 88 \, mmHg$.Since the solution shows negative deviation,$P_{total} Among the given options,only $80 \, mmHg$ is less than $88 \, mmHg$.

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